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Register a new userThe relationship between the effectiveness of the protection means from water hammer and the longitudinal path of pipe
العلاقة بين فعالية وسائل الحماية من الصدمة المائية و المسار الطولي للأنبوب
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Aِl-Baath University ورقة بحثية
Publication date
2015
fields
Civil Engineering
and research's language is
العربية
Authors
معلا المعلا( باحث )
Created by
Shamra Editor
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تم إجراء دراسة تحليلية لأداء عدد من الوسائل المستخدمة للحماية من أخطار الصدمة المائية ( خزان الهواء - صمام كسر الضغط السالب - خزان التوازن ), عند استخدامها مع أنابيب ذات مقاطع طولية مختلفة, و دراسة تغير أداؤها تبعا لشكل المقطع الطولي للأنبوب.
An analytical study was done to explain the relationship between the performance of gas accumulator, surge tank and vacuum breaker valve and the profile of the pipe. The study proved that effectiveness of protection means vary according to the longitudinal path of pipe.
References used
GARR M. JONES , 2006 - pumping station design , Butterworth-heineman ,USA ,640P
Bergant, A, and Simpson, A.R. (1997). Development of a generalized set of pipeline water hammer and column separation equations., University of Adelaide, Adelaide, Australia,350P
جرجي، عادل، و إبراهيم، غسان، 2009 – محطات الضخ . جامعة البعث، سوريا، 422 صفحة.
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Analysis study was done to explain the effect of the
longitudinal section on the values of pressure of the water
hammer resulting from the trip of pumps, which results a low
pressure wave often lead to get cavitation, has been shown from
the anal
ytical study of several profiles and compare the results,
that the shape of the profile and the level of the pressure line
after the stopping of pumps determines the type of cavitation
formed , the region in which it occurs and the pressure values
resulting from it, when the profile doesn’t contain bends or the
bends are below the level of line pressure a distributed
cavitation is occurred, In the case of the presence of high points
, the effect of the bend is linked to several factors:
1 - the greater the height of the bend above line pressure increases the possibility for column separation and increases the pressure
forces.
2 –the pressure forces increase whenever the bend closer to the pumps.
Because of the importance of water hummer and it’s big impact in
pumping pipes, an analytical study of water hummer resulting from
the pumping station abruptly stopped working (due to a power
outage on water pipe line that conveys water from groun
d open tank
to three overhead open tanks was conducted, and without means of
protection from water hummer .
maximum and minimum pressure values and the location of each of
them in the network have been identified.
It was found that the pump trip caused a transient state with
negative pressure along the pipe system. The values of maximum
pressure were less than the pressure tube run.
The shortest path problem can be categorized in to two
different problems; single source shortest path problem (SSSP) and
all pair shortest algorithm (APSP). In this paper, analysis and
comparison between complexity of the famous shortest path
al
gorithms have been made, and the obtained results have shown
that researchers have got remarkable success in designing better
algorithms in the terms of time complexity to solve shortest path
algorithms.
This paper tries to examine the relationship between analogy and the grammatical
rule. Analogy is one of the basic principles and bases of Arabic grammar during times of
rule formation and judging it. Linguists were divided in their attitude to ana
logy, with
some supporting it and others against it. Grammarians were more inclined toward analogy
than compilers, because grammarians’ research was based on the existing similarity
between words, phrases, and style used in speech reported by tellers of what had been said
by the Arabs. They based their rules and origins of analogy on that similarity. Analogists
transliterated some foreign terms, Arabized, and derived new words out of them in a
manner similar to that done with Arabic terms. However, some grammarians went very far
in their excessive use of analogy to the extent that it becomes far removed from linguistic
reality to be a form riddle and guessing, leading to reaction against analogy then against
grammar. Analogy became an end in itself; it overlooked its original purpose; was then
manifested in rule formation of words said spontaneously.
The aim of this study was to identify the level of transformational leadership, organizational commitment, and organizational effectiveness. The study examines the effect of Transformational Leadership and Organizational Commitment on Organizational
Effectiveness from the perspective of workers in Damascus Electricity General Company.
In order to achieve these objectives the researcher used the Correlational Research approach. Questionnaire consisted of (45) items has designed to collect the primary data, it has been distributed to a sample of (82) employees, a (51) Questionnaires were analyzed by using the statistical program (SPSS).
Findings indicated a high level of transformational leadership where the average (4.69), a medium degree of organizational commitment of workers where the mean value reached (3.50), the ratings of a sample of organizational effectiveness was medium where the average (3.48).The study concludes that there is a statistically significant effect of Transformational Leadership and Organizational Commitment on Organizational Effectiveness.
The study recommended to increase the practice of Transformational Leadership. Because of its role in creating the organizational commitment of employees, in order to increase the level of organizational effectiveness of company, which will reflected on raising the level of company’ economic and social performance.
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